Owner`s manual

FRONT PANEL
This indicator lights when the power amplifi er has been switched on. Causes for the
POWER-indicator not lighting are: the appliance is not connected to the mains
or the primary fuse is defective.
The PROTECT LED indicating that one of the internal protection circuits
against thermal overload, short-circuit, Back-EMF, HF-occurrence at the output,
etc., has been activated. The output relays interrupt the connected loads from
the power amps while input signals are interrupted as well, preventing the connected
loudspeaker systems and the power amplifi ers themselves from being damaged.
Whatever caused the fault – e.g. a short-circuited speaker cable – needs to be reme-
died. In case of thermal overload you have to wait until the power amplifi er automati-
cally regains normal operation.
m
odulation is present at the output. The LED is dimmed when speaker cables are
s
hort-circuited or a protection circuit has been activated.
The 0dB LED lights whenever the power amplifi er is driven at its maximum. Higher
n
put volta
g
e does not result in hi
g
her peak output volta
g
e. In addition, the 0dB
n
dicator comes in hand
y
when ad
j
ustin
g
external limiters.
This indicator lights as soon as the integrated dynamic audio signal limiter is
a
ctivated and the power ampli
fi
er is driven at the clippin
g
limit or
g
enerall
y
at its
m
aximum capacit
y
. Short-term blinkin
g
is not a problem, because the internal limiter
c
ontrolls input levels o
f
up to +21dBu down to a THD o
f
approximatel
y
1
%
. I
f
, on the
other hand, this LED lights constantly, reducing the volume is recommended to
prevent the loudspeaker systems connected from being damaged by probable
overload.
Detent potentiometers scaled in dB (steps of 1dB) for
adjusting the power amp’s overall volume. To prevent
distortion in mixing consoles connected to your CP-Series
amp, setting these controls to a value between 0dB and -6dB
is generally recommended. The dB-scale provides direct
indication of the control attenuation applied to the fi xed
internal amplifi cation.
Use the POWER switch, located on the front panel’s, right side to switch the appliance’s power on. The
soft-start function limits against current inrush peaks on the mains, which in addition prevents the mains
line protection switch from activating during power-on. The loudspeaker outputs are activated via relay
switching with a delay of approximately 2 seconds to effi ciently attenuate eventual power-on noise. The
PROTECT LED lights during the delay time and the fans run at maximum speed. This is normal, con-
fi rming the immaculate operation of the protection circuitry.
6